• Spectrum preserving linear mappings between Banach algebras 

      Weigt, Martin (Stellenbosch : Stellenbosch University, 2003-04)
      ENGLISH ABSTRACT: Let A and B be unital complex Banach algebras with identities 1 and I' respectively. A linear map T : A -+ B is invertibility preserving if Tx is invertible in B for every invertible x E A. We say that ...